:root {
            --primary: #6366f1;
            --primary-glow: rgba(99, 102, 241, 0.4);
            --accent-purple: #8b5cf6;
            --bg-dark: #020617;
            --glass: rgba(15, 23, 42, 0.7);
            --border: rgba(255, 255, 255, 0.08);
        }

        body {
            background-color: var(--bg-dark);
            background-image: radial-gradient(circle at 100% 0%, rgba(99, 102, 241, 0.1) 0%, transparent 50%);
            height: 100vh; display: flex; align-items: center; justify-content: center;
            font-family: 'Plus Jakarta Sans', sans-serif; margin: 0; overflow: hidden; color: #f1f5f9;
        }

        .auth-card {
            background: var(--glass); backdrop-filter: blur(25px); border: 1px solid var(--border);
            border-radius: 40px; padding: 3.5rem 3rem; box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
            width: 100%; max-width: 450px;
        }

        .btn-login {
            background: linear-gradient(135deg, var(--primary), var(--accent-purple));
            border: none; border-radius: 18px; padding: 1.1rem; width: 100%; color: white;
            font-weight: 700; transition: all 0.3s; box-shadow: 0 10px 25px -5px var(--primary-glow);
        }

        .form-control-premium {
            background: rgba(255, 255, 255, 0.03); border: 1px solid var(--border);
            border-radius: 18px; padding: 1rem 1.25rem 1rem 3.5rem; color: white; width: 100%;
        }

        .input-icon { position: absolute; left: 1.25rem; top: 50%; transform: translateY(-50%); color: #64748b; }

        .alert-premium {
            background: rgba(239, 68, 68, 0.1); border: 1px solid rgba(239, 68, 68, 0.2);
            color: #fca5a5; border-radius: 16px; padding: 1rem; margin-bottom: 2rem;
        }